A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

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Boeing stays in Vic for 10 years at least

Boeing's Melbourne factory will remain open for a decade at least despite the loss of 300 local jobs.

The US-based aerospace manufacturer will cut 300 workers, mainly on fixed-term contracts, from the current workforce of more than 1300 by the end of the year at its Boeing Aerostructures Australia (BAA) plant in Port Melbourne.

The plant is the sole supplier of some flight control surfaces for the wings of Boeing jets including the flagship 787 Dreamliner, for which it holds a 20-year, $4 billion contract.

Boeing said the move was a natural part of the manufacturing cycle and the end of the contract positions was in line with a long-established financial forecast.

A spokeswoman for Boeing would not be quoted about Boeing's future but confirmed the Dreamliner contract - Australia's largest aerospace contract - was first signed in 2004 and has another 10 years to run.

Victorian Premier Denis Napthine said Boeing would remain in Melbourne for the long term.

"Boeing indicates that this is a fluctuation due to workflows but their main workforce of over 1000 will be continued and will continue well into the future," Dr Napthine told reporters on Thursday.